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CaO对MgO-Al2O3-SiO2系微晶玻璃结构与性能的影响
引用本文:殷哲一,张雪峰,邓磊波.CaO对MgO-Al2O3-SiO2系微晶玻璃结构与性能的影响[J].人工晶体学报,2017,46(11):2107-2114.
作者姓名:殷哲一  张雪峰  邓磊波
作者单位:内蒙古科技大学理学院,包头,014010;内蒙古科技大学内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,包头,014010
基金项目:内蒙古创新引导奖励资金项目(4140300501)
摘    要:以化学纯试剂为原料,采用熔融法制备MgO-Al2O3-SiO2(MAS)系微晶玻璃.利用DSC、XRD、SEM等及理化性能测试手段研究了不同CaO含量对微晶玻璃析晶行为、物相组成、显微结构及理化性能的影响.结果表明:一定含量的CaO可以降低析晶活化能,促进玻璃析晶;随CaO含量的增加,微晶玻璃主晶相由假蓝宝石向α-堇青石转变,晶体形貌由棒状晶转变为枝状晶,晶粒尺寸呈先减后增的趋势;当CaO含量为3wt;时微晶玻璃热膨胀系数和相对介电常数(εr)达到最低,分别为3.89×10-1℃-1和10.09(1 MHz);当不外添CaO时微晶玻璃Vickers硬度达到最大,为10.52 GPa.

关 键 词:CaO  α-堇青石  热膨胀系数  介电性能  

Effect of CaO on Structure and Properties of MgO-Al2O3-SiO2 System Glass Ceramics
YIN Zhe-yi,ZHANG Xue-feng,DENG Lei-bo.Effect of CaO on Structure and Properties of MgO-Al2O3-SiO2 System Glass Ceramics[J].Journal of Synthetic Crystals,2017,46(11):2107-2114.
Authors:YIN Zhe-yi  ZHANG Xue-feng  DENG Lei-bo
Abstract:MgO-Al2O3-SiO2 (MAS)-based glass ceramics were prepared by melting method with pure chemical reagents.The effects of CaO content on crystallization behavior、phase composition、microstructure、physical and chemical properties of glass ceramics were investigated by DSC,XRD,SEM,and performance testing methods.The results show that a certain content of CaO could reduce the activation energy of crystallization,which as a result can promote the glass crystallization;On the other hand,with the increase of CaO,the main crystal phase transfers from sapphirine to α-cordierite,crystal morphology from rod like crystal into dendrite,the grain size decreases at first and then increases;with the addition of 3wt; CaO,the thermal expansion coefficient and the relative dielectric (εr) of glass ceramics show the lowest value,are 3.89 × 10-6℃-1 and 10.09 (1 MHz),respectively;the Vickershardness of samples reach the maximum when no CaO is added,is 10.52 GPa.
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